Refillable cartridge-fuse.



L. E. WEINBERG.

REFILLABLE CARTRIDGE FUSE.

APPLICATION FILED MAY 28. 1914.

1 ,22 6, 1 5 1 Patented May 15, 1917.

W/TNESSES: INVENTOR of the glass tube are weaker than connected interiorly to the end metallic caps 31. The fuse Wire, before rolling, has a central weakened portion 33 and end portions 3-1, which are much broader and stronger. These end portions 84: are rolled up, as shown in Fig 7, to make the C0111- pleted fuse. After the interior cartridge has been completed, it is inserted into the end caps 24 of the outer casing 22 the heads of the inner end caps 31 fitting firmly with in the sockets 25 of the exterior end caps 24, these sockets expanding slightly, be cause the slits 26 admit the interior fuse cartridge. The structure may be thus very easily and quickly assembled or taken apart when a "fuse has blown.

The shoulders 32 are for the purpose of rendering it easy to detach the blown-out fuse from the exterior casing. It sometimes happens that the intense heat, caused by the blowing om of the fuse melts the solder connecting the end caps 31 ofthe tube 30 to that tube, so that this solder coheres to the socket 25 and renders it ditlicult to with draw the tube. The shoulder acts as a shield and prevents any adherence between the inner tube and the outer casin The soldering of the tips of the glass tube to the end caps 31, and the quick plunging of the heated ends of the glass tube 30 into cold Water or the like tends to Weaken the glass at its tips because of the inability of the molecules of the glass to readjust themselves quickly to the rapidly varying changes of temperature, so that the tips the central portion, and hence there is a "well de lined area. of breakage for the glass tube namely, at these weakened ends.

The end caps of the outer and inner tubes maybe suitably perforated to allow the escape of heated gases and the perforations may besuita l protected by Wire gauze The size o he shield 53 may be varied according to the strength of the fuse. so

that it would be irngossible to insert glass 1 J+ 71 :1 Q n l time 80, sate within a sochet 2'! 01 a drain eter adapted to receive said tube 3Q, PSO that it would not be pOSSlblB to introduce tus of greater Cfipfitlty than desired into a given circuit. This shield also centers the glass tube within the outer tube when inserted and maintains it in such central position.

T have described one embodiment of my inventioin but it devised diliering unino; the spir .7 .e

l in the following clains.

dilllil; (30

la a the combination ol. a glass tube, niera end said tube at the ends thereof, and a l of solder intermediate the ends oi said tube and said metallic end ca s solder being quiek- Sb hardened. by ll llill/(i of cold altcr inscrtion between said tube and Mllkl cans in its heated slate. and connecting; said tube and sail l end aps, said .g'l tulle l provided with weakened areas at the lllclQOfl and a fuse element within tube and coiuiecljcd to said caps in a ituse, an or casting. an inner glass tube having; in lic end caps at ends: thereof, a him 0 lllllllf-(l solder in- 'tcrincdiatc and conner "lo ends of said inner tube and metallic vial, caps a ilf'usc elen'ient within said inner time and conncced to said metallic end caps said niclallic end caps having shoulvers projecting thcreilroni, "oi-hung shields zulag; vent coherence of rolled so ([91) out at h llli e. n a us glass tube hair ends thereof, a tcrniediate and inner tube and nicnt Within to said metallic 7 caps having SllOl forming shields m rence of melted sold blowing out or center (aid tube in u ders being: at a .SlZe casin and adapted to icnllc to insert said inner tube ii ing having; a size other than to the size of said shoulders.

In testimony, that I claim tl' foregoing as my inrentioin l have si; -d my name in presence of two subserilnng witnesses.

ll'itncsses 

